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Fast, low-power manipulation of spin ensembles in superconducting microresonators

Anthony J. Sigillito, Hans Malissa, Alexei M. Tyryshkin, Helge Riemann, Nikolai V. Abrosimov, Peter Becker, Hans-Joachim Pohl, Mike L. W. Thewalt, Kohei M. Itoh, John J. L. Morton, Andrew A. Houck, David I. Schuster, S. A. Lyon

Time Reversal Invariant Topologically Insulating Circuits

Ningyuan Jia, Ariel Sommer, David Schuster, Jonathan Simon

With the discovery of the quantum Hall effect and topological insulators, there has been an outpouring of ideas to harness topologically knotted band-structures in the design of state-of-the art, disorder-insensitive materials. From studies of exotic quantum many- body phenomena to applications in spintronics and quantum information processing, topological materials are poised to revolutionize the condensed matter frontier. Here we demonstrate, for the first time, a circuit that behaves as a time-reversal invariant topological insulator for RF photons. In this meta-material, composed of capacitively coupled high-Q inductors, we observe a gapped density of states consistent with a modified Hofstadter spectrum at a flux per plaquette of phi=pi/2. In-situ probes further reveal time-resolved, spin-dependent edge-transport. We leverage the unique flexibility of our materials to investigate, for the first time, features of topological insulators on manifolds such as the Mobius strip. This new approach elucidates the fundamental ingredients essential to topologically active materials, whilst providing a powerful laboratory to study topological physics and a promising route to topological quantum science.

The new cryostat arrives

Our new dilution refrigerator arrives and hits a base temperature of 7mK! Dave M., Andrew, and Kaitlyn work to get the microwave lines and components installed.

Congratulations to Joe Iverson

Congratulations to Joe Iverson for winning the Grainger Foundation Fellowship a scholarship awarded to a junior who is majoring in physics who shows particular interest and aptitude in the laboratory as well as outstanding proficiency in formal coursework. Joe received this award in recognition of his theoretical abilities as well as his work in the Schuster lab on superconducting photonic bandgap resonators.

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Congratulations to Peter Brown

Congratulations to Peter Brown for winning the Lewis Prize awarded to the "best graduating senior in physics." Peter is now off to Princeton University for graduate school where he will study atomic physics.

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Congratulations to Nate Earnest for winning the NSF Graduate Fellowship

The National Science Foundation Graduate Fellowship is awarded by the NSF to graduate students who show promise as leaders in their field.The program recognizes and supports outstanding graduate students in NSF-supported science, technology, engineering, and mathematics disciplines who are pursuing research-based master's and doctoral degrees at accredited United States institutions.

Superconducting coplanar waveguide resonators for low temperature pulsed electron spin resonance spectroscopy

H. Malissa, D. I. Schuster, A. M. Tyryshkin, A. A. Houck, and S. A. Lyon

We discuss the design and implementation of thin film superconducting coplanar waveguide micro-resonators for pulsed ESR experiments. The performance of the resonators with P doped Si epilayer samples is compared to waveguide resonators under equivalent conditions. The high achievable filling factor even for small sized samples and the relatively high Q-factor result in a sensitivity that is superior to that of conventional waveguide resonators, in particular to spins close to the sample surface. The peak microwave power is on the order of a few microwatts, which is compatible with measurements at ultra low temperatures. We also discuss the effect of the nonuniform microwave magnetic field on the Hahn echo power dependence.

Physics with a Bang!

Physics with a Bang! Holiday Lecture and Open House

DECEMBER 8, 2012
Students, families, teachers and especially the curious are invited to attend our annual Holiday Lecture and Open House. See fast, loud, surprising and beautiful physics demos performed by Profs. Heinrich Jaeger and Sidney Nagel. Talk to scientists about their latest discoveries. Participate in hands-on activities related to their research.

Saturday, December 8th, 2012
Kersten Physics Teaching Center
5720 S. Ellis Ave., Chicago, IL

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